When building the project using setup.py, it would pollute the source directory with a lot of virtual environment build directories Move all of those into a common 'build' subdirectory. This eases cleanup of all build directories because they can all be removed with a single rm command. It also places all the various stages of build -> install -> package folders into a common subdirectory so it's easier to find and navigate between them. Example of the new build directory structure build/py3venv/py3.7-qt6.2.0-64bit-release/build/shiboken6 build/py3venv/py3.7-qt6.2.0-64bit-release/build/pyside6 build/py3venv/py3.7-qt6.2.0-64bit-release/install/bin/shiboken6 build/py3venv/py3.7-qt6.2.0-64bit-release/package-lib.macosx-10.14-x86_64-3.7 The last 'package-xyz' subfolder will have its name shortened if the SHORTER_PATHS option is enabled, to avoid path limits on Windows. If no virtualenv is used, change the dir prefix from the previous 'pyside' one to 'qfp' because it's shorter and it's also less confusing that there are both shiboken and pyside subfolders inside 'qfp'. Move the code that always removed the ./build directory on each setup.py invocation into prepare_packages() instead. This way it only removes the files from the 'package' subfolder which is the common packaging location between all the sub-projects. This removal is needed to ensure shiboken files don't end up packaged in the PySide6 wheel. TODO: One more improvement would be to move the bdist_dir and bdist_wheel dirs into the same common subdirectory. This is a bit more complicated to do because it requires computation of the common subfolder and its dependencies in finalize_options of both the 'build' and 'bdist' stages. [ChangeLog][setup.py] Build directories are now created inside the root ./build directory, rather than directly under the root of the project. Pick-to: 6.2 Change-Id: Ie8c0dc27e5067acc9809b9cefaef6be66c76f9dd Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>